Study on Wear and Corrosion Resistance of Laser Clad Cr3Si/Cr2Ni3Si Composite Coatings on Austenitic Stainless Steel

Rapidly solidified wear and corrosion resistant Cr 3Si/Cr 2Ni 3Si metal silicide coatings were fabricated on an austenitic stainless steel 1Cr18Ni9Ti substrate by laser cladding, using Cr Si Ni elemental powder blends as the raw materials. The tribological behavior and corrosion resistance of the coatings were investigated by friction and wear test under ambient dry sliding and anodic polarization curves of the coatings in H 2SO 4 and NaCl solutions. The volume fraction of primary Cr 3Si dendrites has a remarkable influence on the hardness, wear and corrosion resistance of the coating. It is the rapidly solidified microstructural characteristics and the presence of a large amount of hard, wear and corrosion resistant Cr 3Si and Cr 2Ni 3Si that make the coating have excellent wear resistance under ambient dry sliding wear and excellent electrochemical corrosion resistance in 0.5 N H 2SO 4 and 3.5% NaCl aqueous solutions.